Recently added agent tools.

Congressional Documents — full-text search and retrieval over the official

Congress MCP — US Congress data via GovTrack API (free, no auth required)

Confluence MCP — wraps the Confluence Cloud REST API v2 (OAuth)

ConceptNet MCP — open multilingual word/phrase relation graph

Comtrade MCP — UN Comtrade API for international bilateral trade data

EBI Complex Portal MCP.

Companies House MCP — UK statutory company registry (BYO key)

Wikimedia Commons file/image/audio/video search via MediaWiki Action API

Committee Releases — documents congressional committees publish on their OWN

Comic Vine: characters, issues, volumes, creators, publishers. Free key.

Color API MCP — wraps thecolorapi.com (free, no auth)

Color Pizza MCP — names hex colors using human-friendly color-name lists.

Color utilities MCP.

Colombia SECOP MCP — Colombian government procurement (public contracting).

College Scorecard MCP — US Department of Education College Scorecard API

Coinpaprika MCP — alternative crypto data source

CoinMarketCap MCP — crypto prices, market cap, rankings

CoinGecko MCP — wraps CoinGecko free API (no auth required)

Coinbase Exchange public MCP.

Codewars user profiles, completed kata, authored kata, kata detail. Keyless.

Code::Stats public coding-XP profiles (codestats.net)

Codeforces competitive programming users, contests, problems

Cocktails MCP — TheCocktailDB API (free, no auth)

CNPJ Brazil MCP — Brazilian company-registry (Receita Federal) lookup via

Czech National Bank (Česká národní banka, ČNB) public API MCP. Keyless.

CMS Open Payments, with annual dataset discovery through the official DKAN API.

CMS Open Data MCP — US Centers for Medicare & Medicaid Services.

Cloudflare Radar MCP — internet observatory (traffic, attacks, BGP, quality)

Close CRM MCP Pack — wraps the Close (close.com) API v1.

ClinicalTrials MCP — wraps ClinicalTrials.gov API v2 (free, no auth)

NIH Clinical Tables: ICD-10/9, RxTerms, LOINC, NPI, conditions search. Keyless.

Climatiq MCP — carbon footprint calculator with emission factors

Climate & Energy Feeds MCP.

Climate MCP — wraps Open-Meteo Climate API (free, no auth)

ClickUp MCP — wraps the ClickUp REST API v2 (BYO API key)

Cleveland Museum of Art Open Access API (~63k artworks, many CC0)

Clash Royale player, clan, war, tournament, rankings, cards. Supercell dev key.

Civitai MCP.

Citybikes MCP — wraps CityBik.es API (free, no auth required)

CISA Known Exploited Vulnerabilities catalog

Chuck Norris MCP — wraps chucknorris.io (free, no auth)

China A-shares MCP. Keyless.

Chile Government Procurement MCP — Mercado Público / ChileCompra (keyless-ish).

Chess.com MCP — wraps the Chess.com public API (free, no auth)

ChEMBL MCP — drug discovery database (EBI).

PC game deals across Steam/Epic/GOG/Humble via CheapShark. Keyless.

Chargebee MCP Pack — wraps the Chargebee API v2

chaos-index MCP — wraps StupidAPIs (requires X-API-Key)

Chainlist MCP — registry of EVM chains

CFTC Commitment of Traders (COT) MCP.